I prefer the race to be divided into an unlimited class and a stock class.
Stock class must use 400 class brush motor with limitation on no. of cells or maximum input voltage, say max. not > 8.4 or 9.6V.
This can reduce the investment while one can still enjoy a competitive pylon race.
Unlimited class is no restriction on the equipment being used, provided the plane is electric powered with brush or brush-less motor. In this class, everybody can put their rocket science in to build an ultra-fast racer : A good way to burn your $$$ and to crash your plane!!!
Of course, safety is the most important. Some restriction on weight and dimensions must be established.

Ah! I don't prefer man-on-man pylon. It's extremely exciting, especially on unlimited class. Top guns with good pilot always wins. Even experts can create a lot of crashed rubbish.
Besides, one will have to prepare more than one plane for the race. Killing rate in a man-on-man pylon should be high as the stress not only come from speed but also the mad dogs which are chasing you from 3 dimension + the 2 pylon posts.
Speed race in a close circuit,1 competitor by 1 like the F3F as more preferable as the 1st time to organize E-pylon race.

One more aspect to consider is the racing format. F3F's format is easier to manage & requires 2 helpers at pylon A & B and a time keeper. No signal will be issued when the plane has past the pylon. The helper will only signal for the cut that does not past the pylon.
Compared to a 2 pilot man-on-man, helper A & B are required and the time keeper now have to watch for the plane laps on the slower one in the allocated flying period, Then the race can be ended.
For multi-racers man-on-man, it's really a mess that will require helper A & B, an over-all timer-keeper and 1 time-keeper for each racer. Can we afford to have so many voluntareers?Remember, most of them are the pilots. I believe, one can get enough task force at the 1st round. As there will be a killing field, either it will end up with pilots being engaged to fixed their injured planes or there will be a lot of helpers after rounds.
Grouping the pilots for man-on-man is difficult. I dare not to be put in the group with YellowBrothers or George and some more excellent pilots. Surely, I'll be a helper after the 1st round if the race is not held in combination of 'double rounds'.

Is it possible for HKRCSS provide certain general guidelines now ? I need to understand requirements like wing span size, motor and battery limitations etc. We need time to buy, build and test fly electric planes

In the HKRCSS committee meeting last Sunday, we have discussed the preliminary rules.
Basically, the pylon track will be between two poles of 100m apart and it is a timing event much like F3F. The fastest will win. In order to get some experience in organizing such event, this time we only allow flying wing made of EPP. The wing span is limited to 48". The motor can be brushed or brushless but with a rating of 400 class only. The battery is either 7-cell NiCd/NiMH (8.4v) or 2-cell LiPo (7.4v).

Proposal on the track as the F3F is good & easy to manage. However, I don't agree with the race will only be limited to EPP flying wing for the 1st time. In fact, the race can be organized into 2 classes: =< 48" EPP and =< 1m (or around 1m) plane. It'll allow the participants to have their choices to start with. Firstly, it may start with 400 class or equiv. motor with the battery spec as said. This arrangement allows the flexiblity to upgrade the power unit for the later events instead of dropping the EPP and switch to other type of pylon racers for performance advancement.

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